/* ============================================================
   Design system — 复刻 liuhouliang.com
   Tailwind slate 色系 + 蓝色强调 + 暗色模式
   ============================================================ */

:root {
  --bg-primary: #fff;
  --bg-secondary: #f8fafc;
  --bg-surface: #fff;
  --border-color: #e2e8f0;
  --border-subtle: #f1f5f9;
  --text-primary: #0f172a;
  --text-secondary: #334155;
  --text-muted: #64748b;
  --accent: #2563eb;
  --accent-hover: #1d4ed8;
  --accent-light: #2563eb0f;
  --amber-bg: #f99c001a;
  --amber-text: #b45309;
  --amber-border: #f99c0033;
  --emerald-bg: #00bb7f1a;
  --emerald-text: #047857;
  --blue-bg: #3080ff1a;
  --blue-text: #2563eb;
  --radius-card: 1rem;       /* rounded-2xl */
  --radius-pill: 0.5rem;     /* rounded-lg/md */
  --container: 64rem;        /* max-w-5xl */
  --font-sans: Inter, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    "Helvetica Neue", "Noto Sans", Arial, "PingFang SC", "Hiragino Sans GB",
    "Microsoft YaHei UI", "Microsoft YaHei", "Source Han Sans CN", "Noto Sans SC", sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, Monaco,
    Consolas, "Liberation Mono", "Courier New", monospace;
}

html.dark {
  --bg-primary: #0a0b10;
  --bg-secondary: #12131a;
  --bg-surface: #12131a;
  --border-color: #282c3f;
  --border-subtle: #1c202e;
  --text-primary: #e2e8f0;
  --text-secondary: #cbd5e1;
  --text-muted: #94a3b8;
  --accent: #3b82f6;
  --accent-hover: #60a5fa;
  --accent-light: #3b82f61f;
  --amber-bg: #f99c0026;
  --amber-text: #fbbf24;
  --amber-border: #f99c0055;
  --emerald-bg: #00bb7f26;
  --emerald-text: #34d399;
  --blue-bg: #3080ff26;
  --blue-text: #60a5fa;
}

* { box-sizing: border-box; border-color: var(--border-color); }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  min-height: 100vh;
  background: var(--bg-secondary);
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-size: 15px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

a { color: inherit; text-decoration: none; }

/* ---------- 玻璃拟态头部 ---------- */
.glass {
  -webkit-backdrop-filter: blur(14px);
  backdrop-filter: blur(14px);
  background: #ffffffe0;
}
html.dark .glass { background: #0a0b10e0; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  width: 100%;
  border-bottom: 1px solid var(--border-color);
  transition: background-color .2s, border-color .2s;
}
.site-header .inner {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 1rem;
  height: 4rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

/* 品牌 */
.brand { display: flex; align-items: center; gap: .65rem; flex-shrink: 0; }
.brand img {
  width: 2.25rem; height: 2.25rem;
  border-radius: 9999px;
  object-fit: cover;
  box-shadow: 0 1px 2px #0000001a;
  transition: all .3s;
}
.brand .ring {
  box-shadow: 0 0 0 2px var(--accent-light);
  transition: box-shadow .3s;
}
.brand:hover img { box-shadow: 0 0 0 2px var(--accent); }
.brand span {
  font-weight: 700;
  font-size: 1.05rem;
  letter-spacing: -.01em;
  color: var(--text-primary);
  transition: color .2s;
}
.brand:hover span { color: var(--accent); }

/* 桌面导航胶囊 */
.nav-desktop { display: none; align-items: center; gap: .375rem; }
@media (min-width: 1024px) { .nav-desktop { display: flex; } }
.nav-desktop a {
  padding: .375rem .875rem;
  border-radius: var(--radius-pill);
  font-size: 15px;
  font-weight: 500;
  color: var(--text-secondary);
  transition: all .2s;
  white-space: nowrap;
}
.nav-desktop a:hover {
  color: var(--text-primary);
  background: color-mix(in srgb, var(--text-muted) 10%, transparent);
}
.nav-desktop a.active {
  color: var(--accent);
  background: var(--accent-light);
  font-weight: 600;
}

/* 右侧操作 */
.actions { display: flex; align-items: center; gap: .375rem; }
.icon-btn {
  width: 2.25rem; height: 2.25rem;
  display: inline-flex; align-items: center; justify-content: center;
  border-radius: var(--radius-pill);
  color: var(--text-secondary);
  transition: all .2s;
  cursor: pointer;
  background: transparent;
  border: none;
}
.icon-btn:hover {
  color: var(--text-primary);
  background: color-mix(in srgb, var(--text-muted) 12%, transparent);
}
.icon-btn svg { width: 1.15rem; height: 1.15rem; }

/* ---------- 主容器 ---------- */
main {
  max-width: var(--container);
  width: 100%;
  margin: 0 auto;
  padding: 1.5rem 1rem 3rem;
}
@media (min-width: 640px) { main { padding: 2rem 1.5rem 4rem; } }

/* ---------- Hero ---------- */
.hero {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 1.25rem;
  padding: .5rem 0 1.5rem;
  border-bottom: 1px solid var(--border-color);
  margin-bottom: 1.75rem;
}
@media (min-width: 640px) { .hero { padding: 1rem 0 2rem; } }

.hero-avatar {
  width: 5rem; height: 5rem;
  border-radius: 1.25rem;
  object-fit: cover;
  box-shadow: 0 4px 14px #0000001f;
}
.hero h1 {
  margin: 0;
  font-size: 1.875rem;
  font-weight: 800;
  letter-spacing: -.02em;
  color: var(--text-primary);
}
.hero .bio {
  max-width: 42rem;
  margin: 0;
  color: var(--text-secondary);
  font-size: 1rem;
  line-height: 1.7;
}
.hero .links { display: flex; flex-wrap: wrap; gap: .5rem; }

/* 统计卡网格（grid-cols-2 lg:grid-cols-4） */
.stat-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: .875rem;
  width: 100%;
  margin-top: .5rem;
}
@media (min-width: 1024px) { .stat-grid { grid-template-columns: repeat(4, minmax(0, 1fr)); } }

.stat-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-card);
  padding: 1rem;
  display: flex;
  align-items: center;
  gap: .75rem;
  transition: all .3s cubic-bezier(.4,0,.2,1);
}
.stat-card:hover { border-color: color-mix(in srgb, var(--accent) 45%, transparent); transform: translateY(-2px); }
.stat-icon {
  width: 2rem; height: 2rem;
  border-radius: .75rem;
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0;
}
.stat-icon svg { width: 1.1rem; height: 1.1rem; }
.stat-meta .num { font-weight: 700; font-size: .95rem; color: var(--text-primary); line-height: 1.2; }
.stat-meta .label { font-size: .75rem; color: var(--text-muted); margin-top: .15rem; }

/* ---------- 区块标题 ---------- */
.section-title {
  display: flex;
  align-items: center;
  gap: 1rem;
  justify-content: center;
  margin: 2rem 0 1.5rem;
  font-size: 1.25rem;
  font-weight: 600;
  letter-spacing: -.01em;
}
.section-title::before, .section-title::after {
  content: "";
  opacity: .85;
  background: var(--text-muted);
  border-radius: 9999px;
  width: 38px; height: 1.5px;
}
html.dark .section-title::before, html.dark .section-title::after { background: #475569; }

/* ---------- 项目卡片网格 ---------- */
.project-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
}
@media (min-width: 640px) { .project-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); } }

/* 卡片组件（card-base / card-hover 1:1 复刻） */
.card-base {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-color);
  box-shadow: 0 1px 2px #0000000a;
}
html.dark .card-base { box-shadow: 0 2px 8px -2px #0000004d; }

.card-hover { transition: all .3s cubic-bezier(.4,0,.2,1); }
.card-hover:hover {
  border-color: color-mix(in srgb, var(--accent) 45%, transparent);
  transform: translateY(-2px);
  box-shadow: 0 10px 25px -5px color-mix(in srgb, var(--accent) 12%, transparent);
}

.repo-card {
  position: relative;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  padding: 1rem 1.25rem;
  border-radius: var(--radius-card);
}
.repo-card .top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 12px;
  color: var(--text-muted);
  margin-bottom: .625rem;
}
.pill {
  display: inline-flex;
  align-items: center;
  gap: .3rem;
  padding: .125rem .5rem;
  border-radius: var(--radius-pill);
  font-size: 11px;
  font-weight: 500;
  border: 1px solid transparent;
}
.pill-featured {
  background: var(--amber-bg);
  color: var(--amber-text);
  border-color: var(--amber-border);
}
.pill-lang { background: var(--blue-bg); color: var(--blue-text); border-color: color-mix(in srgb, var(--blue-text) 20%, transparent); }
.lang-dot { width: .5rem; height: .5rem; border-radius: 9999px; }
.repo-card .date { font-family: var(--font-mono); font-size: 12px; color: var(--text-muted); flex-shrink: 0; }

.repo-card h3 {
  margin: 0;
  font-size: 1.0625rem;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.35;
  transition: color .2s;
}
.repo-card:hover h3 { color: var(--accent); }
.repo-card h3 a { display: block; }
.repo-card h3 a::after { content: ""; position: absolute; inset: 0; z-index: 0; }

.repo-card .desc {
  margin: .5rem 0 0;
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.6;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.repo-card .foot {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-top: .9rem;
  font-size: 12px;
  color: var(--text-muted);
}
.repo-card .foot .stat { display: inline-flex; align-items: center; gap: .3rem; }
.repo-card .foot svg { width: .85rem; height: .85rem; }
.repo-card .foot .spacer { flex: 1; }
.repo-card .foot .go {
  display: inline-flex; align-items: center; gap: .25rem;
  color: var(--accent);
  font-weight: 500;
  position: relative; z-index: 1;
}
.repo-card .foot .go:hover { color: var(--accent-hover); }

/* 语言色（GitHub linguist） */
.lang-JS { background: #f1e05a; }
.lang-TS { background: #3178c6; }
.lang-PY { background: #3572A5; }
.lang-GO { background: #00ADD8; }
.lang-RS { background: #dea584; }
.lang-CPP { background: #f34b7d; }
.lang-C { background: #555555; }
.lang-JAVA { background: #b07219; }
.lang-HTML { background: #e34c26; }
.lang-CSS { background: #563d7c; }
.lang-VUE { background: #41b883; }
.lang-SH { background: #89e51c; }
.lang-RB { background: #701516; }
.lang-RUST { background: #dea584; }
.lang-OTHER { background: #8b949e; }

/* ---------- 关于 ---------- */
.about {
  max-width: 42rem;
  margin: 2.5rem auto 0;
  padding-top: 2rem;
  border-top: 1px solid var(--border-color);
  color: var(--text-secondary);
  font-size: .95rem;
  line-height: 1.8;
}

/* ---------- Footer ---------- */
.site-footer {
  max-width: var(--container);
  margin: 0 auto;
  padding: 2rem 1rem 3rem;
  text-align: center;
  color: var(--text-muted);
  font-size: .8rem;
}
.site-footer a { color: var(--text-muted); }
.site-footer a:hover { color: var(--accent); }
.beian-link { margin-left: .5rem; color: var(--text-muted); }
.beian-link:hover { color: var(--accent); }

/* ---------- 关于内容 ---------- */
.about-content { margin-top: .5rem; color: var(--text-secondary); }
.about-content p { margin: 0 0 1rem; }
.about-content a { color: var(--accent); }

/* 移动端导航（简单展开） */
.nav-mobile { display: flex; }
@media (min-width: 1024px) { .nav-mobile { display: none; } }
.mobile-menu {
  display: none;
  position: fixed;
  inset: 4rem 0 auto 0;
  background: var(--bg-surface);
  border-bottom: 1px solid var(--border-color);
  padding: .5rem 1rem 1rem;
  z-index: 39;
  flex-direction: column;
  gap: .25rem;
}
.mobile-menu.open { display: flex; }
.mobile-menu a {
  padding: .6rem .75rem;
  border-radius: var(--radius-pill);
  color: var(--text-secondary);
  font-weight: 500;
}
.mobile-menu a:hover { background: var(--bg-secondary); color: var(--text-primary); }


/* 项目卡片 hover 提示层 */
.repo-card { position: relative; overflow: visible; }
.repo-tooltip {
  display: none;
  position: absolute;
  bottom: calc(100% + .5rem);
  left: 50%;
  transform: translateX(-50%);
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-card);
  padding: .75rem;
  box-shadow: 0 4px 12px rgba(0,0,0,.1);
  z-index: 100;
  min-width: 220px;
  text-align: center;
}
.repo-card:hover .repo-tooltip { display: block; }

.about-tooltip {
  display: none;
  position: absolute;
  bottom: calc(100% + .5rem);
  left: 50%;
  transform: translateX(-50%);
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-card);
  padding: .75rem;
  box-shadow: 0 4px 12px rgba(0,0,0,.1);
  z-index: 100;
  min-width: 180px;
  text-align: center;
}

.about-tooltip {
  display: none;
  position: absolute;
  bottom: calc(100% + .5rem);
  left: 50%;
  transform: translateX(-50%);
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-card);
  padding: .75rem;
  box-shadow: 0 4px 12px rgba(0,0,0,.1);
  z-index: 100;
  min-width: 180px;
  text-align: center;
}
/* 加载态 */
.loading {
  text-align: center;
  color: var(--text-muted);
  padding: 3rem 0;
  font-size: .9rem;
}

/* ============================================================
   关于页（独立页面，模仿 liuhouliang.com/about 前部分）
   ============================================================ */
.about-page {
  max-width: var(--container);
  width: 100%;
  margin: 0 auto;
  padding: 2rem 1rem 3rem;
}
@media (min-width: 640px) { .about-page { padding: 2.5rem 1.5rem 4rem; } }

.about-hero {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: .5rem;
  padding-bottom: 1.75rem;
  border-bottom: 1px solid var(--border-color);
}
.about-greeting { margin: 0; color: var(--text-muted); font-size: 1rem; }
.about-hero h1 {
  margin: 0;
  font-size: 2.25rem;
  font-weight: 800;
  letter-spacing: -.02em;
  color: var(--text-primary);
}
.about-role { margin: 0; color: var(--accent); font-weight: 600; font-size: 1.05rem; }
.about-bio { margin: .25rem 0 0; max-width: 42rem; color: var(--text-secondary); line-height: 1.7; }
.tag-row { display: flex; flex-wrap: wrap; gap: .5rem; margin-top: .5rem; }
.tag-pill {
  padding: .3rem .8rem;
  border-radius: 9999px;
  background: var(--accent-light);
  color: var(--accent);
  font-size: .85rem;
  font-weight: 500;
}

.about-section { margin-top: 2.5rem; }
.about-h2 {
  margin: 0 0 1.1rem;
  font-size: 1.25rem;
  font-weight: 600;
  letter-spacing: -.01em;
  color: var(--text-primary);
}

.info-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: .875rem;
}
@media (min-width: 768px) { .info-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); } }

.info-card {
  position: relative;
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-card);
  padding: 1rem 1.15rem;
  transition: all .3s cubic-bezier(.4, 0, .2, 1);
}
.info-card:hover { border-color: color-mix(in srgb, var(--accent) 45%, transparent); }
.info-label { font-size: .8rem; color: var(--text-muted); margin-bottom: .4rem; }
.info-value { font-size: .95rem; color: var(--text-primary); font-weight: 500; word-break: break-word; }
.info-value a { color: var(--accent); }

.timeline {
  position: relative;
  margin-top: .25rem;
  padding-left: 1.4rem;
  border-left: 2px solid var(--border-color);
}
.timeline-item { position: relative; padding-bottom: 1.4rem; }
.timeline-item:last-child { padding-bottom: 0; }
.timeline-item::before {
  content: "";
  position: absolute;
  left: -1.68rem;
  top: .3rem;
  width: .7rem;
  height: .7rem;
  border-radius: 9999px;
  background: var(--accent);
  border: 2px solid var(--bg-surface);
  box-sizing: content-box;
}
.timeline-date { font-family: var(--font-mono); font-size: .8rem; color: var(--text-muted); }
.timeline-text { color: var(--text-secondary); margin-top: .15rem; line-height: 1.6; }